Removal of cadmium from contaminated waters using saltbush (Atriplex canescens) biomass: identification of Cd binding sites
by Maather F. Sawalha, Jose R. Peralta-Videa, Jason G. Parsons, Jorge H. Gonzalez, Jorge L. Gardea-Torresdey
International Journal of Environment and Pollution (IJEP), Vol. 34, No. 1/2/3/4, 2008

Abstract: The effect of pH on Cd(II) binding capacity of saltbush biomass was determined. Metal quantification performed using ICP/OES showed that Cd binding increased as pH increased from 2.0 to 5.0. The highest percentage of Cd bound ranged from 74-81%, 22-40%, and 70-80% for the native, esterified, and hydrolysed biomass. XAS studies showed that cadmium was present as Cd(II) and oxygen was the nearest neighbouring atom with bond lengths of approximately 2.3 Å and coordination numbers ranging between 4 and 5. Results indicated that carboxyl groups may be the primary ligand involved in the Cd binding by saltbush biomass.

Online publication date: Thu, 16-Oct-2008

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